CN111157763A - On-site calibration method for vibration acceleration monitoring equipment of engineering structure - Google Patents
On-site calibration method for vibration acceleration monitoring equipment of engineering structure Download PDFInfo
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- CN111157763A CN111157763A CN202010028445.6A CN202010028445A CN111157763A CN 111157763 A CN111157763 A CN 111157763A CN 202010028445 A CN202010028445 A CN 202010028445A CN 111157763 A CN111157763 A CN 111157763A
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- G—PHYSICS
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The invention relates to a field calibration method of engineering structure vibration acceleration monitoring equipment, which is used for calibrating a sensor to be calibrated on the field and comprises the following steps: determining the vertical weight m and the impact angle range of the gravity pendulum based on the measuring range and the precision of the sensor to be calibrated, and planning the condition setting of on-site calibration groups; the standard acceleration sensor and the on-site sensor to be calibrated are kept on the same high level, and synchronous measurement with the sensor to be calibrated is realized; the fixed support is adsorbed to a sensor mounting plane through a magnet to be fixed, the gravity pendulum and the fixed support are connected through a movable pin shaft, different pin hole positions are combined to obtain the proper length of the swing arm, and the gravity pendulum is guaranteed to be capable of being hammered to the position of a sensor anti-base to be calibrated; acquiring a calibration coefficient of a sensor to be calibrated on site; and constructing a calibration parameter curve to finish calibration.
Description
Technical Field
The invention relates to a field calibration method of real-time monitoring equipment for vibration acceleration of an engineering structure.
Background
With the development of ocean engineering industry in China, the numerical and intelligent ocean platform is gradually paid attention to and popularized. The vibration acceleration sensor is used as important equipment for ocean structure health monitoring, has the advantages of strong adaptability, convenience in installation, reliable monitoring data and the like, and is one of necessary equipment for realizing ocean platform numeralization and intellectualization. However, the acceleration sensor inevitably drifts after long-time operation, thereby causing the distortion of monitoring data, affecting managers to analyze data, even causing the false early warning of a monitoring system and interfering the normal operation of a platform.
At present, parameters of the acceleration sensor are usually calibrated by professional personnel in onshore indoor experiments, including a gravity field method and a comparison method, and the acceleration sensor installed on a platform in the field is also calibrated by being returned to the onshore laboratory after being disassembled. On one hand, the calibration mode can terminate the continuity of the monitoring data for a long time, so that the real-time performance of the monitoring system cannot be guaranteed; on the other hand, the additional disassembly and assembly process on the site is needed, the normal operation of the platform on the site is disturbed, and time and labor are consumed.
Based on the reasons, the research and development of the on-site calibration method suitable for the ocean platform structure vibration acceleration real-time monitoring equipment has practical engineering significance.
Disclosure of Invention
On the premise of comprehensively considering convenient operation and economy, the invention provides a field calibration method applied to a structural vibration acceleration real-time monitoring device. The method is simple to operate, does not need to disassemble the acceleration sensor, can ensure the working continuity of the monitoring system, and can be used for directly calibrating the field sensor by an operator, thereby achieving the purposes of cost reduction and efficiency improvement. In order to achieve the purpose, the invention adopts the following technical scheme:
a field calibration method of engineering structure vibration acceleration monitoring equipment is used for calibrating a sensor to be calibrated on the field and comprises a gravity pendulum, a fixed support, a standard acceleration sensor, a sensor calibration and calibration system, a movable pin shaft and an angle positioning pin shaft. The acceleration sensor to be calibrated and the acceleration sensor to be calibrated are fixed on the same base, and the weight pendulum is connected with the weight hammer; the fixed support is obliquely fixed on the working platform, and an arc-shaped angle support rod is fixed on the fixed support; the weight pendulum and the fixed bracket are provided with pin holes, the weight pendulum and the fixed bracket are connected through a movable pin shaft, different hole position combinations are changed, and different support heights and pendulum lengths are obtained so as to adapt to different field conditions and obtain different impact loads on the base; angle positioning pin holes are uniformly formed in the arc angle brace rod; fixing the gravity pendulum at different angles through a positioning pin shaft; determining the initial angle of the weight pendulum by changing the position of the angle positioning pin shaft; and the standard acceleration sensor is connected with the sensor calibration system to acquire acceleration data. The field calibration steps are as follows:
(1) determining the vertical weight m and the impact angle range [ theta ] of the gravity pendulum based on the measuring range and the precision of the sensor to be calibratedmin,θmax]Planning the condition settings of the field calibration set, i.e. determining (m, theta)i)jWherein i is 1, 2, … … n is different impact angles, j is 1, 2, … … k is the calibration repetition number, n is more than or equal to 5, and k is more than or equal to 5;
(2) the standard acceleration sensor and the on-site sensor to be calibrated are kept on the same high level, and synchronous measurement with the sensor to be calibrated is realized;
(3) the fixed support is adsorbed to a sensor mounting plane through a magnet to be fixed, the gravity pendulum and the fixed support are connected through a movable pin shaft, different pin hole positions are combined to obtain the proper length of the swing arm, and the gravity pendulum is guaranteed to be capable of being hammered to the position of a sensor anti-base to be calibrated;
(4) according to the planned calibration times, the angle positioning pin shaft is inserted into the corresponding angle positioning pin hole on the arc angle brace rod to complete the first group of impact angle parameters (m, theta)1) Setting (2);
(5) after the gravity pendulum is installed and set, the positioning pin shaft is instantly pulled out to enable the gravity pendulum to freely swing downwards, the supporting base of the sensor to be calibrated is instantly hit, a sensor calibration and calibration system acquires vibration signals of a standard acceleration sensor, and calibration coefficients of the sensor to be calibrated on site are acquired through a direct comparison method;
(6) completing one test after the vibration of the tested object is attenuated; repeatedly performing gravity pendulum with the same angle theta1Performing the calibration test for not less than 5 times, and taking the experimental average value of the calibration coefficient;
(7) to finish the same angle theta1After the calibration, other attack angle angles of the gravity pendulum are obtained by changing the insertion position of the angle positioning pin shaft, and then the steps (4) to (6) are repeated, and the calibration is continued until all the angles theta are completediAnd (5) forming a bias curve by the following test, thereby constructing a calibration parameter curve and completing calibration.
The invention discloses a field calibration method with simple operation aiming at the characteristics of vibration acceleration of an engineering structure, which is based on a momentum principle, adopts a portable and easily-assembled gravity pendulum device, instantaneously hammers a base of an acceleration sensor to be calibrated through weights with different weights and impact angles, applies load excitation with different sizes to the sensor to be calibrated, then synchronously acquires hammering vibration signals by adopting a standard acceleration sensor, repeatedly acquires measurement results of different hammering loads, calculates the bias of the signals acquired by the sensor to be calibrated and the standard sensor through data acquisition program processing, and forms a calibration coefficient to finish the calibration of the sensor. The invention has the substantive characteristics that: (1) based on the principle that gravity pendulum impact generates constant acceleration excitation, different acceleration excitations are obtained by adjusting the impact angle of the gravity pendulum; (2) setting a reference standard for a sensor to be calibrated, namely configuring a standard acceleration sensor which passes calibration, and synchronously measuring the acceleration sensor and the calibrated sensor to form a reference system; (3) and (3) forming a bias curve by adopting a repeated calibration method, namely, at least 5 impact loads are adopted for calibration and each impact load is repeated for at least 5 times, thereby eliminating the interference influence in field measurement. The invention is applied to the field calibration of the real-time monitoring equipment of the vibration acceleration of the engineering structure, and has the following advantages:
1. the calibration method disclosed by the invention is easy to operate and strong in field adaptability, and solves the technical problem that real-time effective calibration cannot be carried out at present;
2. the invention uses the impact load of the weight hammer as excitation, adopts a direct comparison method, uses the standard acceleration sensor to calibrate the field sensor, does not need to disassemble the sensor which is installed on the field, and has high speed and high accuracy.
Drawings
FIG. 1 is an elevation view of the present invention during field calibration.
Fig. 2 is a side view of the present invention during field calibration.
Fig. 3 is a top view of the present invention in field calibration.
The reference numbers in the figures illustrate: 1 is a gravity pendulum; 2 is a fixed bracket; 3 is a standard acceleration sensor; 4, calibrating the system for sensor calibration; 5 is a movable pin shaft; 6 is an angle positioning pin shaft; 7 is a weight hammer; 8 is a fixed magnet; 9 is an arc angle brace rod; and 10, an explosion-proof box of the sensor to be calibrated.
Detailed Description
The invention is described below with reference to the accompanying drawings and examples. Fig. 1 to 3 show examples of the gravity pendulum device provided by the method of the present invention, so as to satisfy the basic requirement that the measured value of the reference frame sensor and the sensor to be calibrated have the same acceleration input when the acceleration sensor is calibrated in the field, that is, the gravity pendulum device has a stable support base and an angle limiting mechanism for real-time adjustment.
The specific implementation mode is described by combining the sample, the gravity pendulum device for on-site calibration of the acceleration sensor comprises a gravity pendulum 1, a fixed support 2, a standard acceleration sensor 3, a sensor calibration system 4, a movable pin 5 and an angle positioning pin 6, wherein the gravity pendulum 1 is connected with a weight hammer 7, the tail end of the fixed support 2 is connected with a fixed magnet 8, an arc angle support rod 9 is fixed in the middle of the fixed support 2, the included angle between the fixed support 2 and the horizontal plane is α and is 60 degrees optimally, the fixed support 2 is fixed on a working plane through the adsorption force of the fixed magnet 8, pin holes are formed in the gravity pendulum 1 and the fixed support 2 and are connected through the movable pin 5, different hole position combinations are changed, different support heights and pendulum lengths are obtained to adapt to different on-site conditions and obtain different impact loads, angle positioning pin holes are uniformly formed in the arc angle support rod 9, one positioning pin hole is arranged at each interval theta, the positioning pin 6 supports the gravity pendulum 1, the gravity pendulum is fixed on different angles, the impact angle of the gravity pendulum 1, the impact angle is accurately positioned, the impact angle positioning pin 6 is changed, so that the impact angle of the gravity pendulum is changed, the impact angle of the impact pendulum, the impact angle of.
When the field calibration is carried out, the specific steps are as follows:
(1) determining the vertical weight m and the impact angle range [ theta ] of the gravity pendulum based on the measuring range and the precision of the sensor to be calibratedmin,θmax]And then planning the condition setting of the field calibration set, i.e. determining (m, theta)i)jWherein i is 1, 2, … … n is different impact angles, j is 1, 2, … … k is the calibration repetition number, n is more than or equal to 5, and k is more than or equal to 5;
(2) fixing a standard acceleration sensor 3 on an explosion-proof box 10 of a sensor to be calibrated on site, and connecting a sensor calibration and calibration system 4; the standard acceleration sensor 3 and a sensor to be calibrated on site are kept on the same high level, and synchronous measurement with the sensor to be detected is realized;
(3) the fixing support 2 is adsorbed to a sensor mounting plane through a magnet to be fixed, the gravity pendulum 1 and the fixing support 2 are connected through a movable pin shaft 5, different pin hole positions are combined to obtain a proper swing arm length, and the gravity pendulum 1 can be hammered to the position of a sensor anti-base to be calibrated;
(4) according to the planned calibration times, the angle positioning pin shaft 6 is inserted into the corresponding angle positioning pin hole on the arc angle brace rod 9 to complete the first group of impact angle parameters (m, theta)1) Setting (2);
(5) after the gravity pendulum is installed and set, the positioning pin shaft 6 is instantly drawn out to enable the gravity pendulum 1 to freely swing downwards, a supporting base of the sensor to be calibrated is instantly hit, a sensor calibration and calibration system 4 acquires vibration signals of a standard acceleration sensor 3, and calibration coefficients of the sensor to be calibrated on site are acquired through a direct comparison method;
(6) completing one test after the vibration of the tested object is attenuated; repeatedly carrying out gravity pendulum 1 with the same angle theta1Performing the calibration test for not less than 5 times, and taking the experimental average value of the calibration coefficient;
(7) to finish the same angle theta1After the lower calibration, other attack angle angles of the gravity pendulum 1 are obtained by changing the insertion position of the angle positioning pin shaft 6, and then the steps (4) to (4) are repeatedAnd (6) continuing to calibrate until all angles theta are finishediAnd (5) testing to form a bias curve, thereby constructing a calibration parameter curve, writing in a data acquisition program and finishing final calibration.
According to the invention, the impact load formed by the gravity pendulum is adopted, the hammering acceleration signal of the acceleration sensor to be calibrated is synchronously acquired by adopting the standard acceleration sensor, the calibration coefficient of the acceleration sensor to be calibrated on site is acquired by utilizing a comparison method, and a simple and convenient calibration method is provided for an engineering structure.
Claims (1)
1. A field calibration method of engineering structure vibration acceleration monitoring equipment is used for calibrating a sensor to be calibrated on the field and comprises a gravity pendulum, a fixed support, a standard acceleration sensor, a sensor calibration and calibration system, a movable pin shaft and an angle positioning pin shaft. The acceleration sensor to be calibrated and the acceleration sensor to be calibrated are fixed on the same base, and the weight pendulum is connected with the weight hammer; the fixed support is obliquely fixed on the working platform, and an arc-shaped angle support rod is fixed on the fixed support; the weight pendulum and the fixed bracket are provided with pin holes, the weight pendulum and the fixed bracket are connected through a movable pin shaft, different hole position combinations are changed, and different support heights and pendulum lengths are obtained so as to adapt to different field conditions and obtain different impact loads on the base; angle positioning pin holes are uniformly formed in the arc angle brace rod; fixing the gravity pendulum at different angles through a positioning pin shaft; determining the initial angle of the weight pendulum by changing the position of the angle positioning pin shaft; and the standard acceleration sensor is connected with the sensor calibration system to acquire acceleration data. The field calibration steps are as follows:
(1) determining the vertical weight m and the impact angle range [ theta ] of the gravity pendulum based on the measuring range and the precision of the sensor to be calibratedmin,θmax]Planning the condition settings of the field calibration set, i.e. determining (m, theta)i)jWherein i is 1, 2, … … n is different impact angles, j is 1, 2, … … k is the calibration repetition number, n is more than or equal to 5, and k is more than or equal to 5;
(2) the standard acceleration sensor and the on-site sensor to be calibrated are kept on the same high level, and synchronous measurement with the sensor to be calibrated is realized;
(3) the fixed support is adsorbed to a sensor mounting plane through a magnet to be fixed, the gravity pendulum and the fixed support are connected through a movable pin shaft, different pin hole positions are combined to obtain the proper length of the swing arm, and the gravity pendulum is guaranteed to be capable of being hammered to the position of a sensor anti-base to be calibrated;
(4) according to the planned calibration times, the angle positioning pin shaft is inserted into the corresponding angle positioning pin hole on the arc angle brace rod to complete the first group of impact angle parameters (m, theta)1) Setting (2);
(5) after the gravity pendulum is installed and set, the positioning pin shaft is instantly pulled out to enable the gravity pendulum to freely swing downwards, the supporting base of the sensor to be calibrated is instantly hit, a sensor calibration and calibration system acquires vibration signals of a standard acceleration sensor, and calibration coefficients of the sensor to be calibrated on site are acquired through a direct comparison method;
(6) completing one test after the vibration of the tested object is attenuated; repeatedly performing gravity pendulum with the same angle theta1Performing the calibration test for not less than 5 times, and taking the experimental average value of the calibration coefficient;
(7) to finish the same angle theta1After the calibration, other attack angle angles of the gravity pendulum are obtained by changing the insertion position of the angle positioning pin shaft, and then the steps (4) to (6) are repeated, and the calibration is continued until all the angles theta are completediAnd (5) forming a bias curve by the following test, thereby constructing a calibration parameter curve and completing calibration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010028445.6A CN111157763A (en) | 2020-01-10 | 2020-01-10 | On-site calibration method for vibration acceleration monitoring equipment of engineering structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216131A (en) * | 2021-04-02 | 2021-08-06 | 东南大学 | On-site calibration method of in-situ test equipment |
| CN113376404A (en) * | 2021-05-19 | 2021-09-10 | 中寰卫星导航通信有限公司 | Calibration verification system, device, method and storage medium |
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| CN203133115U (en) * | 2013-03-21 | 2013-08-14 | 天津大学 | Multi-accelerometer intelligent parameter identification, matching and hardware generation system |
| CN106918721A (en) * | 2017-03-29 | 2017-07-04 | 苏州尚领医疗科技有限公司 | A kind of method for checking acceleration transducer displacement |
| CN107843711A (en) * | 2017-09-27 | 2018-03-27 | 上海申元岩土工程有限公司 | A kind of dynamic consolidation construction effect detection method based on impact acceleration |
| CN108593966A (en) * | 2018-06-26 | 2018-09-28 | 北京航天控制仪器研究所 | Two axis frame pendulous accelerometer self-calibrating methods of one kind and system |
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2020
- 2020-01-10 CN CN202010028445.6A patent/CN111157763A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4052882A (en) * | 1974-12-14 | 1977-10-11 | Volkswagenwerk Aktiengesellschaft | Testing and calibrating instrument |
| CN203133115U (en) * | 2013-03-21 | 2013-08-14 | 天津大学 | Multi-accelerometer intelligent parameter identification, matching and hardware generation system |
| CN106918721A (en) * | 2017-03-29 | 2017-07-04 | 苏州尚领医疗科技有限公司 | A kind of method for checking acceleration transducer displacement |
| CN107843711A (en) * | 2017-09-27 | 2018-03-27 | 上海申元岩土工程有限公司 | A kind of dynamic consolidation construction effect detection method based on impact acceleration |
| CN108593966A (en) * | 2018-06-26 | 2018-09-28 | 北京航天控制仪器研究所 | Two axis frame pendulous accelerometer self-calibrating methods of one kind and system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216131A (en) * | 2021-04-02 | 2021-08-06 | 东南大学 | On-site calibration method of in-situ test equipment |
| CN113216131B (en) * | 2021-04-02 | 2022-05-20 | 东南大学 | On-site calibration method of in-situ test equipment |
| CN113376404A (en) * | 2021-05-19 | 2021-09-10 | 中寰卫星导航通信有限公司 | Calibration verification system, device, method and storage medium |
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Application publication date: 20200515 |